324 Syiphidae. 



middle : the front margin of the spots is sometimes somewhat in- 

 definite and in rare cases the segment is here somewhat yellowish so 

 that the spots seem produced forwards and being of a triangular 

 shape, but generally the pyriform shape may, however, be seen in 

 certain lights; the spots on- third segment lie a little from the front 

 margin; they are somewhat triangular with the fore margin straight, 

 the hind margin sloping forwards towards the middle, and they go 

 near to each other in the middle, or they meet here forming a deeply 

 emarginate band ; the side margin begins near the hinder corner, it is 

 straight but sloping inwards towards the anterior and meeting the 

 fore margin angularly ; the spots on fourth segment similar ; none of 

 the spots go over the side margin, and it is characteristic that they 

 all have the posterior outer corner nearest the side margin ; the hind 

 margin of fourth segment yellow and the fifth segment with large 

 basal corner spots, forming together with the yellow margin of fourth 

 segment an emarginate band. The hairs on abdomen follow the 

 ground colour, but are somewhat pale at the base and black at apex ; 

 also on the spots on fourth segment are some black hairs; at the 

 sides the hairs are long and yellow at the base, for the rest altern- 

 ating black and yellow but only few black at the hind corners of the 

 second segment. Venter yellowish, with long, pale hairs, shorter and 

 sometimes black at apex. Genitalia relatively large, reddish, black 

 behind eight segment on the right side; the hairs black. Legs some- 

 what varying, from all dark yellowish or pale brownish yellow with 

 the tarsi a little darker towards the end, and hind femora and tibiæ 

 with faint indications of darker colour, to more dark with the anterior 

 femora a little darkened near the base, hind femora and tiblæ blackish 

 with base and apex of femora and base of tibiæ paler, hind tarsi 

 blackish and anterior tarsi blackish towards the end. The hairs on 

 femora are rather long and conspicuous, they are yellow, but on 

 front femora black towards apex, on middle femora in about the 

 apical half; the short hairs are yellow, but black on the anterior side 

 of hind femora and at the apex all round, and on dorsal and anterior 

 side of hind tibiæ; these latter have an antero-dorsal fringe, long 

 about the middle. Wings hyaline to slightly brownish tinged. Squa- 

 mulæ yellowish with a dark yellow margin and fringe. Halteres yellow, 

 Female. Vertex not broad, the shining black area quadrate, from 

 it stretches a black, often indistinct middle stripe down to a black 

 triangle or lunule above the antennæ, below the triangle a yellow 

 lunule; for the rest the frons yellowish pruinose; the hairs black. 

 Abdomen sometimes less parallel-sided than in the male, the markings 

 smaller, often somewhat hoary {modestiis). Legs as in the male. 



